Observatory log
Tokyo and Seongnam, compared
- 01Difference now
Tokyo and Seongnam have the same time.
Tokyo: JST (UTC+9) · Seongnam: KST (UTC+9)
- 02Through 2026–2027
The difference stays the same all year.
- 1 January 2026 – 31 December 2027Same time
Difference of Seongnam from Tokyo. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
- Mon–Fri: 09:00–17:00 in Tokyo = 09:00–17:00 in Seongnam · 8 h
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
09:00–17:00 in Tokyo = 09:00–17:00 in Seongnam
Inside both working days (Mon–Fri).
- 05Weekend
Tokyo: Saturday and Sunday
Seongnam: Saturday and Sunday
24 hours
A day in Tokyo, in Seongnam
| Tokyo | Seongnam | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 00:00 | |
| 01:00 | 01:00 | |
| 02:00 | 02:00 | |
| 03:00 | 03:00 | |
| 04:00 | 04:00 | |
| 05:00 | 05:00 | |
| 06:00 | 06:00 | |
| 07:00 | 07:00 | |
| 08:00 | 08:00 | |
| 09:00 | 09:00 | |
| 10:00 | 10:00 | |
| 11:00 | 11:00 | |
| 12:00 | 12:00 | |
| 13:00 | 13:00 | |
| 14:00 | 14:00 | |
| 15:00 | 15:00 | |
| 16:00 | 16:00 | |
| 17:00 | 17:00 | |
| 18:00 | 18:00 | |
| 19:00 | 19:00 | |
| 20:00 | 20:00 | |
| 21:00 | 21:00 | |
| 22:00 | 22:00 | |
| 23:00 | 23:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Tokyo and Seongnam
More time differences with Tokyo
Questions
Asked about Tokyo and Seongnam
What is the time difference between Tokyo and Seongnam?
Tokyo and Seongnam have the same time. The difference stays the same all year.
What is the best time for a call between Tokyo and Seongnam?
Inside both working days: Mon–Fri: 09:00–17:00 in Tokyo = 09:00–17:00 in Seongnam · 8 h.
When does the time difference between Tokyo and Seongnam change?
It does not change in the next 12 months: Tokyo and Seongnam either keep the same time all year or change their clocks on the same dates.